I have a rocker switch that mounts on the R100GS dash panel that came with a grip set I got from Germany (part #61 31 1 459 234 in Solo Lobo's post). I am waiting on a new switch for my R80G/S that should come this next week. If the new switch mates with my harness then I won't need the rocker switch. It has High/Off/Low positions. I don't know what shipping to Turkey is going to cost but I would be willing to sell it to you.
Pic of the part